Dear all,
I have a XV432 that seems deaf compared to my ICOM IC-7000. When I
tune to a local beacon on 432.300 MHz, I can copy it clearly on the IC
but nothing is heard on the XV432/K3 with KXV3B. I checked transverter
set up by feeding it a signal from a signal gen. It has a conversion
gain of about 16 to 17dB. The specs say 20dB. This does seem to be too
bad.
I checked the front end RF circuit out by feeding in a -80dBm signal
from HP8657B signal generator set to 432.300MHz. The ATF34143 seems to
have a net gain of 11dB. The next MMIC MAV11 seems to have a gain of
10.5dB. Are these within spec?
If I can fix it without altering the circuit, that would be ideal.
Else, I am considering two mods:
Replace the MAV11 (10 to 12db gain in specs) with MAR8 (27dB gain) with
appropriate change in the bias resistor (120 1W to 270 ohms 1/4W)Insert
a W6PQL LNA (uses PGA103+) between K10 and the ATF on board.
Thoughts/ideas are very welcome,
Raj
--
Raj Dewan, N2RD
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